Contents: small plastic board with relief 13 yellow + 13 black plastic balls "Players compete against each other by moving the balls a row at a time. Form a square of 3x3 balls of your color to win" A player can keep pushing rows as long as the ball that comes out belongs to that same player. Therefore, there are two things to worry about, the 3x3 square to be made, and to try to keep your turn for a few pushes. It comes with instructions for solo game.